Engineering Materials Practice Set-8

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1. Steel made from phosphate iron is

Hard

Ductile

Tough

Brittle

2. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

710

1015

35

3. Cold rolled steel sheets contain carbon of the following order

0.1%

0.6%

0.2%

0.4%

4. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Manganese

Chromium

Vanadium

5. Which is false statement about tempering? Tempering is done to

Release stresses

Improve ductility

Improve machinability

Improve toughness

6. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Cobalt

Iron

7. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

70% copper and 30% zinc

8. Hardness of upper bainite (acicular structure) is about

RC 80

RC 65

RC 57

RC 48

9. Chromium in steel

Improves wear resistance, cutting ability and toughness

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

10. Carbon in iron is an example of

Substitutional solution

Interstitial solid solution

Intermetallic compounds

All of the above

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11. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Nickel, copper and iron

Iron, zinc and bismuth

Copper, nickel and antimony

12. Free cutting steels

Do not exist

Are used where ease in machining is the criterion

Require least cutting force

Contain carbon in free form

13. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

High carbon steel

Aluminium

14. Phosphor bronze contains

1% phosphorous

None of the above

0.5% of phosphorous

2.5% phosphorous

15. High carbon steel carries carbon percentage

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

0.8 to 1.5%

16. Nimonic contains __________ percentage of nickel as that of Inconel.

More

Same

None of these

Less

17. An example of amorphous material is

Lead

Silver

Glass

Zinc

18. Shock resisting steels should have

Low tensile strength

Low wear resistance

Toughness

Low hardness

19. Delta metal is an alloy of

Copper, zinc and iron

Iron, nickel and copper

Iron, aluminium and magnesium

Iron, lead and tin

20. The machinability of steel is increased by

Silicon and sulphur

Phosphorous, lead and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

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21. The hardness of steel increases if it contains

Cementite

Pearlite

Martensite

Austenite

22. Argentite is the principal ore or raw material for

Tin

Aluminium

Silver

Zinc

23. Preheating is essential in welding

All of the above

Cast iron

High speed steel

All nonferrous materials

24. Drop forging dies contain carbon of the order of

0.6 to 0.7%

0.25 to 0.5%

0.7 to 0.9%

0.1 to 0.2%

25. Beryllium bronze has

(A) High yield point

(D) None of these

(B) High fatigue limit

(C) Both (A) and (B)

26. Weld decay is the phenomenon found with

Cast iron

Stainless steel

Mild steel

Nonferrous materials

27. Corrosion resistance of steel is increased by adding

Aluminium and zinc

Tungsten and sulphur

Chromium and nickel

Nickel and molybdenum

28. Manganese in steel increases its

Hardness

Ductility

Tensile strength

Fluidity

29. Melting point of iron is

1539°C

1601°C

1489°C

1712°C

30. Which of the following is used for bearing liner?

Gun metal

Bronze

Bell metal

Babbitt metal

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31. Tungsten in high speed steel provides

Hot hardness

Toughness

Sharp cutting edge

Wear resistance

32. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

33. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

10 : 90

50 : 50

40 : 60

34. The hardness is the property of a material due to which it

Can cut another metal

Can be rolled or hammered into thin sheets

Breaks with little permanent distortion

Can be drawn into wires

35. The crystal structure of brass is

H.C.P.

F.C.C.

Orthorhombic crystalline structure

B.C.C.

36. The presence of sulphur in pig iron makes

The casting unsound

It brittle

It hard

It easily machinable

37. Sulphur in cast iron

Increases hardness and brittleness

Make the iron white and hard

Makes the iron soft and easily machinable

Aids fusibility and fluidity

38. Bronze contains

70% copper and 30% zinc

70 - 75% copper and rest tin

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

39. The alloy used for making electrical resistances and heating elements is

Nichrome

Invar

Elinvar

Magnin

40. Cupola produces following material

Wrought iron

Malleable iron

Pig iron

Cast iron

Engineering Materials Practice Set-8

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